CN105791657B - A kind of image module focusing method - Google Patents
A kind of image module focusing method Download PDFInfo
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- CN105791657B CN105791657B CN201410797009.XA CN201410797009A CN105791657B CN 105791657 B CN105791657 B CN 105791657B CN 201410797009 A CN201410797009 A CN 201410797009A CN 105791657 B CN105791657 B CN 105791657B
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Abstract
The present invention relates to a kind of image module focusing methods, the adjusting direction that the method has the camera lens of the different fixed high image mould groups by obtaining the image information judgement for the mark version for being marked with mark point, adjust the step-length for adjusting the actuating motor of camera lens in direction and the adjustment image mould group in real time according to the position of the camera lens of the image mould group simultaneously, it realizes that classification focusing plays the quality of the camera lens of the image mould group of different optical characteristics, improves the product yield rate and production efficiency of the image mould group.
Description
Technical field
The present invention relates to a kind of image module focusing methods, are particularly applied to a kind of image of image mould group automatic focusing
Module focusing method.
Background technique
With the development of image mould group industry, the requirement to image mould group imaging high Qinghua, high-quality has become image
The developing goal of mould group industry, this is also meaned that, in process of production, also increasing to image module focusing difficulty.Example
Such as in mobile phone camera industry, current high pixel module focusing, traditional mode is using artificial focusing.Also occur in the industry
Automatic focusing method.Relatively traditional artificial focusing, existing automatic focusing method can be avoided the damage generated in artificial focusing, mention
Height focusing efficiency, improves consistency.However, there is also certain limitations for existing automatic focusing method.It is mainly manifested in:
1) high request height is determined to mould group.
Existing automatic focusing method carries out automatic focusing based on the good supposed premise of surely high comparison of coherence.Some also needs
To determine the high position to very close OK point, just be able to achieve automatic focusing, for not needing to navigate near the position OK, focus
Process is just relatively very slow.Secondly, for fixed high inaccurate or reprocessed products, focusing collet and camera lens are unable to accurate match, are easy
Existing cosmetic injury.Some automatic focusing algorithms do not support fixed high inaccurate situation, limitation very big.
2) focus adjustment method poor compatibility.
Existing automatic focusing method, dependent on the optical characteristics of mould group itself, showed between different machines it is widely different, more
It is in need that focus adjustment method is modified according to the machine of the image mould group of switching, cause producing line reaction slow.
3) camera lens quality cannot be given full play to.
Existing automatic focusing method has been crossed after PASS standard with regard to stopping after stopping or backspin fixed angle.So simultaneously
Mould group is not adjusted to the optimal position of resolving power, causes the waste of image mould group quality.
Summary of the invention
It is an object of the present invention to provide a kind of image module focusing method, the image module focusing method passes through
Obtain be marked with mark point one mark version image information judge camera lens fixed high of the image mould group and adjust according to this with
Suitable for different fixed high image mould groups.
Another object of the present invention is to provide a kind of image module focusing method, the image module focusing method according to
The image information of the mark version adjusts the focusing direction of the camera lens of the image mould group in real time and adjusts the image mould group
The step-length of the actuating motor of camera lens realizes classification focusing to realize the image module focusing method to the institute of different optical characteristics
The adjusting for stating the camera lens of image mould group improves the product yield rate and production efficiency of the image mould group.
Another object of the present invention is to provide a kind of image module focusing method, the image module focusing method is able to
Reach focusing it is qualified in the case where according to the lens properties of the image mould group continue to focus to the image mould group with
Give full play to the camera lens quality of the image mould group.
Another object of the present invention is to provide a kind of image module focusing methods, by setting up mark point in the mark version
It is able to detecting distance d current between the pixel for obtaining each evaluation and test region of the mark version, and then is able to be focused according to ideal
Scale value D under state between the mark point0The camera lens of the image mould group is determined with the size relation of the detecting distance d
Adjustment direction.
Another object of the present invention is to provide a kind of image module focusing method, the image module focusing method is able to
The currently fixed high h of the camera lens of the image mould group is obtained by laser ranging technique and the camera lens of the image mould group is determined into height
The average height H being adjusted under ideal focus state0, and then the camera lens for being avoided the image mould group currently determines high position not
It is good and lead to the unresolvable focusing rate shown and improve the image mould group in the mark etching face.
Another object of the present invention is to provide a kind of image module focusing method, the method is able to provide the image
The calculation method of the adjustment angle of the camera lens of mould group improves so that the camera lens of the image mould group is able to accurately be focused
The production yield of the image mould group.
Another object of the present invention is to provide a kind of image module focusing method, the method is able to through the evaluation and test
The variation of the modulation transfer function in region is described further to judge come the level for determining the center resolving power in the evaluation and test region
Whether the adjusting direction of the camera lens of image mould group is correct.
Another object of the present invention is to provide a kind of image module focusing methods, and the method includes intelligent decision mistakes
Journey, the intelligent decision process are achieved the modulation transfer function superposition to each evaluation and test region, with the further accurate shadow
As the accuracy of the focusing position of the camera lens of mould group.
Another object of the present invention is to provide a kind of image module focusing method, the intelligent decision process is achieved
The detection of multidirectional modulation transfer function in the evaluation and test region, and then improve the suitable of the image module focusing method
The property used.
In order to achieve the above object, the present invention provides a kind of image module focusing method, described method includes following steps:
A: the image information of mark version is obtained by image mould group；
B: drive the camera lens of the image mould group mobile according to the image information；
C: the focussing process of the camera lens of image mould group described in intelligent decision；And
D: judging whether focusing is completed, no to then follow the steps A, is the focusing movement for exiting presently described image mould group,
Wherein, the image information of the mark version includes the pixel distance detected value d of mark point in the evaluation and test region of the mark version and described
Mark the modulation delivery value in the evaluation and test region of version.
It preferably, further comprise following steps between the step A and the step B；If the shadow of the mark version
As information and the camera lens of the image mould group it is ideal focus position when the image information it is consistent, then follow the steps D.
Preferably, the step B further comprises following steps:
B1: by comparing the detected value d and scale value D0Size judge the image mould group camera lens moving direction,
Wherein, the scale value D0For the image mould group camera lens complete focusing the ideally described mark point between pixel
Distance, if the detected value d is greater than the scale value D0, then the camera lens of image mould group described in backspin；If the detected value d is less than institute
State scale value D0, then the camera lens of the image mould group is above revolved；And
B2: judged according to the variation of the modulation delivery value in the mobile forward and backward assessment region of the camera lens of the image mould group
The camera lens of the image mould group continues to move to direction, if the modulation delivery value in the evaluation and test region is big before relatively adjusting after the adjustment,
Then continue mobile towards former direction；If the modulation delivery value in the evaluation and test region is small before relatively adjusting after the adjustment, adjust in the opposite direction
Section.
Preferably, the move angle for calculating the camera lens of the image mould group is further comprised the steps of: before the step B1,
In, there are linear relationship, slopes for the backspin angle of the camera lens of the detected value d and the image mould group are as follows:Pass through public affairs
Formula θ=(d-D0) × k is able to calculate the angle that the camera lens for obtaining the image mould group needs movement.
It is noted that if the camera lens of the image mould group currently determines ideal of the Gao Yuqi when completing to focus position
Fixed high difference is larger, then further comprises the steps of: before step A and adjusts camera lens to described ideal fixed high of the image mould group and put down
Height H0, wherein the image mould group currently determines the acquisition of high pass laser ranging technique.
It is noted that the step B is also able to further comprise following steps:
B1: the first deviation D of settingupperAnd the second deviation Dlower, the camera lens of the image mould group is in completion focusing
Ideally the pixel distance between the mark point is scale value D0, the first deviation DupperGreater than the scale value D0,
The second deviation DlowerLess than the scale value D0；And
B2: judge the current detected value d in the evaluation and test region whether between the first deviation DupperWith institute
State the second deviation DlowerBetween, if it is not, the camera lens of the image mould group is then driven to make the detected value d towards scale value D0It leans on
Closely, the scale value D0For the image mould group camera lens complete focusing the ideally described mark point between pixel away from
From.
Preferably, the step B2 further includes following steps: the move angle of the camera lens of the image mould group is calculated,
In, there are linear relationship, slopes for the backspin angle of the camera lens of the detected value d and the image mould group are as follows:Pass through public affairs
Formula θ=(d-D0) × k, which is calculated, to be obtained the camera lens of the image mould group and needs mobile angle, so that the detected value d is towards institute
State scale value D0It is close.
Preferably, the step B further comprises step B3: the current center resolving power and reason in the evaluation and test region
The evaluation and test center of maximum resolving power that has of region when focus state is thought to adjust the camera lens for driving the image mould group
The step-length of actuating motor, if the current center resolving power in the evaluation and test region is MTFstd1, the MTFstd1Lower than the assessment area
The center of maximum resolving power in domain 1/3 when, the actuating motor is with the first step-length θstd1The camera lens of the image mould group is carried out
Adjustment；If the current center resolving power in the evaluation and test region is MTFstd2The MTFstd2Higher than the MTFstd1And lower than described
Test and assess region center of maximum resolving power 2/3 when, the actuating motor is with the second step-length θstd2To the mirror of the image mould group
Head is adjusted；If the current center resolving power in the evaluation and test region is greater than the MTFstd2But it is less than the evaluation and test region most
When big center resolving power, the actuating motor is with third step-length θfineThe camera lens of the image mould group is adjusted, wherein institute
State the first step-length θstd1, the second step-length θstd2And the third step-length θfineIt is sequentially increased.
Preferably, the step C further comprises step C1: it is further to modulate transmitting data processing technique by omnidirection
It executes and the camera adjusting of the image mould group is acted.
Preferably, the step C1 further comprises following steps:
C1.1: the adjusting data of the camera lens of the image mould group are collected；And
C1.2: the focusing parameter of the camera lens of the image mould group is corrected, wherein the focusing parameter includes for different batches
The focusing parameter of the secondary image mould group.
It is noted that the focusing movement for exiting presently described image mould group includes presently described shadow in the step D
As the ideal focusing of mould group completion and the image mould group are more than that maximum focuses number to play the product of the camera lens of the image mould group
Matter.
Detailed description of the invention
If Fig. 1 is that a kind of mark version image of one preferred embodiment of image module focusing method of one embodiment of the present invention shows
It is intended to.
As Fig. 2 be a kind of mark point of one preferred embodiment of image module focusing method of one embodiment of the present invention with comment
Survey the modulation transfer function variation diagram in region.
A process if Fig. 3 is a kind of one preferred embodiment of image module focusing method of one embodiment of the present invention is illustrated
Figure.
If Fig. 4 is that a kind of another process of one preferred embodiment of image module focusing method of one embodiment of the present invention is shown
It is intended to.
If Fig. 5 is that a kind of part process of one preferred embodiment of image module focusing method of one embodiment of the present invention is shown
It is intended to.
If Fig. 6 is a kind of another part stream of one preferred embodiment of image module focusing method of one embodiment of the present invention
Journey schematic diagram.
It flows another part if Fig. 7 is a kind of one preferred embodiment of image module focusing method of one embodiment of the present invention
Journey schematic diagram.
It flows another part if Fig. 8 is a kind of one preferred embodiment of image module focusing method of one embodiment of the present invention
Journey schematic diagram.
If Fig. 9 is a kind of another part stream of one preferred embodiment of image module focusing method of one embodiment of the present invention
Journey schematic diagram.
If Figure 10 is a kind of another part of one preferred embodiment of image module focusing method of one embodiment of the present invention
Flow diagram.
Specific embodiment
Claim according to the present invention and specification disclosure of that, technical solution of the present invention literary institute specific as follows
It states.
If Fig. 1 to Figure 10 is a kind of schematic diagram of image module focusing method of the present invention, the image module focusing method
It is able to be applied to image mould group automatic focusing, while improving the focusing rate of the image mould group, more be able to described in guarantee
The accuracy and consistency of image module focusing, and then improve the production yield for influencing mould group.
It is noted that the image mould group includes that the digital products such as TV, PC, tablet computer, mobile phone are taken the photograph
As head mould group, in the preferred embodiment, for being applied to the image mould group of mobile phone.
Further, the image module focusing method is overcome the different fixed high image mould groups and executes automatic
The location information of the camera lens of image mould group described in quick obtaining and control action motor drive the mirror of the image mould group when focusing
Head is to complete to focus.
The image mould group passes through the image of one mark version of intake and judges the movement according to the image information of the mark version
The movement of motor, and then driven by the actuating motor and to be revolved on the camera lens of the image mould group or backspin completes focusing with clear
Imaging.
It is noted that the vacation good relative to the fixed high comparison of coherence of traditional camera lens based on the image mould group
And if the automatic focusing carried out, the image module focusing method be able to according to the camera lens of the image mould group it is real-time highly into
Row adjustment cannot achieve quick exact focusing in the case where surely high consistency is poor to avoid the camera lens of the image mould group
It may.
It will be further appreciated that needing for the part image mould group in the position ten of the camera lens of the image mould group
The position that the nearly focusing of tap is completed just is able to realize automatic focusing, the image module focusing by traditional automatic focusing method
Method is overcome above-mentioned traditional automatic focusing method Shortcomings, that is to say, that the image module focusing method has
Strong applicability, and at the same time being able to improve the production yield and product of the image mould group by the image module focusing method
Productivity.
Specifically, in the one side of this preferred embodiment, when the fixed height of the image mould group is uncertain, the image
Mould group is by obtaining the pixel distance detected value d of the mark point in the mark version and completing to focus with the camera lens of the image mould group
And it is in the pixel distance scale value D of mark point when ideal position0Compare the camera lens for judging the image mould group
Moving direction, that is to say, that by comparing the detected value d and scale value D0Size be able to determine the actuating motor
Direction of action, and then determine that the moving direction of the camera lens of the image mould group is acted to quickly complete focusing.
When the detected value d is greater than the scale value D0When, the actuating motor drives the camera lens of the image mould group downward
Rotation；When the detected value d is less than the scale value D0When, the actuating motor drives the camera lens of the image mould group to revolve upwards
Turn.
It is noted that the camera lens of the image mould group is able to described dynamic when the actuating motor rotates upwards
Make to be rotated down under the driving of motor；When the actuating motor is rotated down, the camera lens of the image mould group is able to described
It is rotated upwards under the driving of actuating motor, that is to say, that the actuating motor is opposite with the movement of camera lens of the image mould group
On the contrary.
Preferably, as shown in Figure 1, in the preferred embodiment, the mark board marker has four mark points, the label
Point be respectively mark point P1, mark point P2, mark point P3 and mark point P4, respectively two-by-two intercept four mark points between away from
From d1 and d2, the detected value d is able to acquire by publicity d=(d1+d2)/2.
Further, described in forward and backward image mould group intake is adjusted according to the camera lens of the image mould group
The resolving power situation of change in the evaluation and test region (Rol:Region Of Interest) of version image is marked to determine the image mould group
Camera lens moving direction it is whether correct.In the preferred embodiment, if it is described evaluation and test region modulation transfer function (MTF:
Modulation Transfer Function) value is horizontal come the resolving power for determining the evaluation and test region, that is to say, that pass through institute
The variation of modulation transfer function is stated to obtain the variation of the resolving power level in the evaluation and test region.Specifically, if the evaluation and test area
The resolving power in domain is promoted before relatively driving after the camera lens of the image mould group is driven by the actuating motor, then the image mould group
Camera lens continue it is mobile towards former direction, conversely, the moving direction of the camera lens of the image mould group is then changed, in other words, if institute
The modulating transfer function value that region is surveyed in commentary relatively drives front lower after the camera lens of the image mould group is driven by the actuating motor
Drop, then the actuating motor is driven in the reverse direction the camera lens of the image mould group.
In the another aspect of this preferred embodiment, when the current location of the image module group lens is compared with reason when completing focusing
When thinking position farther out, the image module focusing method is able to the mirror by measuring the image mould group using laser ranging technique
The currently fixed high h of head, and then the average height H according to the resonable scenario of camera lens of the image mould group when high0And by the image
The camera lens of mould group is adjusted to the average height H in advance0, thus further according to it is described mark version the mark point the detected value d and
The scale value D0The camera lens of the image mould group is adjusted.It to sum up states, the image module focusing method is suitable for
The image mould group of the fixed high situation of difference, i.e., the described image module focusing method have strong applicability, meanwhile, the image mould
The product that group focus adjustment method is able to improve the image mould group under the premise of not reducing the focusing low efficiency of the image mould group goes out
Yield.
In another aspect of this invention, for its chip portfolio of the camera lens of different optical characteristics during upper rotation or backspin
There are different Picture Showings, that is to say, that the different image mould groups are in focussing process, the image information of the mark version
Variation characteristic it is inconsistent, in turn, need to determine controlled plant of the camera lens of the image mould group in focussing process, in time adjust
The camera lens moving direction of the image mould group and moving distance etc..
In the preferred embodiment, as shown in Fig. 2, the backspin angle, θ of the detected value d and the camera lens of the image mould group
Between there are linear relationship, slope isSet the first deviation DupperAnd the second deviation Dlower, the scale value D0It is situated between
In the first deviation DupperAnd the second deviation DlowerBetween, the first deviation DupperGreater than the scale value
D0, the second deviation DlowerLess than the scale value D0.The image information for detecting the mark version obtains the detected value d, when
The detected value d is in the first deviation DupperAnd the second deviation DlowerWhen except range, the actuating motor is driven
Rotation or backspin are moved on the camera lens of the image mould group so that the detected value d is to the scale value D0It is close, wherein the camera lens
Adjusting angle, θ be able to pass through formula: (d-D0) × k is acquired, and in turn, the actuating motor is able to according to the angle acquired
θ drives the camera lens of the image mould group to make the detected value d to the scale value D0It is close.
While adjusting the camera lens movement of the image mould group, by the analysis of the resolving power to the evaluation and test region, divide
Grade ground adjusts the step-length of the actuating motor, that is to say, that the actuating motor is able to the resolving power according to the evaluation and test region
The camera lens of the image mould group is driven with different step-lengths, to improve the image mould under the premise of completing focusing movement
The accuracy of focusing of the camera lens of group.
Specifically, according to the center resolving power level in the evaluation and test region with the modulation transfer function in the evaluation and test region
The increase of value and the characteristics of promoted, pass through modulation and pass the variation of transmission function and solve picture to evaluate and test the current center in region described in comparison
The center of maximum resolving power that the evaluation and test region has when power and ideal focus state is to adjust the driving image mould group
The step-length of the actuating motor of camera lens, if the current center resolving power in the evaluation and test region is MTFstd1, the MTFstd1Lower than described
Test and assess region center of maximum resolving power 1/3 when, the actuating motor is with the first step-length θstd1To the mirror of the image mould group
Head is adjusted；If the current center resolving power in the evaluation and test region is MTFstd2The MTFstd2Higher than the MTFstd1And it is low
When the 2/3 of the center of maximum resolving power in the assessment region, the actuating motor is with the second step-length θstd2To the image mould
The camera lens of group is adjusted；If the current center resolving power in the evaluation and test region is greater than the MTFstd2But it is less than the evaluation and test area
When the center of maximum resolving power in domain, the actuating motor is with third step-length θfineThe camera lens of the image mould group is adjusted,
Wherein, the first step-length θstd1, the second step-length θstd2And the third step-length θfineIt is sequentially increased, in turn, is able to root
Make the actuating motor using different step-lengths to the image mould group according to the current location of the camera lens of the image mould group
Camera lens carry out classification focusing, and then while completing the lens focusing to the image mould group, be improved the image
The efficiency of module focusing improves the production yield of the image mould group.
Preferably, the image module focusing method preferably includes intelligent decision process, since the image mould group has
In the presence of the inclined possibility of parent, the modulation transfer function in the same evaluation and test region changes inconsistent, the different evaluation and test area
Domain is particularly evident, and the intelligent decision process is able to become by the modulation transfer function for being superimposed each assessment region respectively
Change curve to analyze and determine whether each assessment region all has a possibility that completing focusing standard, to obtain more accurate
Adjust direction and the angle of the camera lens of the image mould group, so eliminate the image mould group there are when inclination conditions to ideal
The influence of focusing position, improves the product yield rate of the image mould group.
It is noted that while obtaining the modulating transfer function value in each assessment region, the image
Mould group assessment method is able to be modified test error and filter small fluctuation simultaneously, and then is improved the image mould
The accuracy of focusing of group.
The intelligent decision process is able to be suitable for the multi-direction of the assessment region, such as x-direction and y-direction, Yi Jidan
Direction, such as the detection of the modulating transfer function value of X-direction or Y-direction, in turn, the image module focusing method is fitted
The applicability of the image mould group is improved for the image mould group of a variety of requirements.
To sum up state, the intelligent decision process be preferably able to using omnidirection modulation transfer function data processing technique with
Enhance the applicability of the image module focusing method and the accuracy to the image module focusing.
In addition to this, the intelligent decision process of the image module focusing method is able to exist for partial image mould group
Existing acquired mark version image center modulating transfer function value is basically unchanged and the tune of quadrangle when close ideal focus state
The lower characteristic of modulation trnasfer function value and filter out lower one section of the modulating transfer function value of quadrangle.It is worth mentioning
It is that the lens chip combination of such image mould group has biggish depth of focus.
Preferably, the image module focusing method is able to be automatically updated simultaneously according to the batch and model of the image mould group
The adjusting parameter of the camera lens of the image mould group is corrected, and then realizes that the camera lens of the how various image mould groups is accurately focused to mention
The product yield rate of the high image mould group.
It is noted that the intelligent decision process be able to be collected simultaneously various data obtained in deterministic process with
It is included for image mould set product production information retrospect and batch products focusing condition.
In still another aspect of the invention, the image module focusing method is able to be adjusted according to the characteristic of the image mould group
The camera lens of the image mould group plays the quality of the camera lens of the image mould group to optimum position, compares traditional focus adjustment method
The camera adjusting of the image mould group is just exited to focusing movement to eligible state, the image module focusing method is more set
It sets the focusing result such as good, outstanding and until system exits focusing movement, so that the quality of the camera lens of the image mould group
It is able to be given full play to, improves the product yield rate of the image mould group.
It is as shown in Figures 3 to 10 the flow diagram of the image module focusing method, the image module focusing side
Method includes the following steps:
A: the image information of the mark version is absorbed by image mould group；
B: according to the image information of the mark version, the actuating motor drives the camera lens of the image mould group mobile；
C: the focussing process of the camera lens of image mould group described in intelligent decision；And
D: judging whether focusing is completed, no to then follow the steps A, is the focusing movement for exiting presently described image mould group,
Wherein, the focusing movement for exiting presently described image mould group includes that presently described image mould group completes ideal focusing and the image
Mould group is more than maximum focusing number.
In the one side of this method, as shown in figure 5, the step B further comprises following steps:
B1: by comparing the detected value d and scale value D0Size judge the image mould group camera lens movement
Direction, if the detected value d is greater than the scale value D0, then the camera lens of image mould group described in backspin；If the detected value d is less than institute
State scale value D0, then the camera lens of the image mould group is above revolved；And
B2: sentenced according to the variation of the modulating transfer function value in the camera lens of the image mould group mobile front and back assessment region
The camera lens for the image mould group of breaking continues to move to direction, if the modulating transfer function value in the evaluation and test region relatively adjusts after the adjustment
It is preceding big, then continue mobile towards former direction；If small, court before the modulating transfer function value in the evaluation and test region relatively adjusts after the adjustment
Opposite direction is adjusted.
As shown in Figure 6, it is preferable that the camera lens for calculating the image mould group is further comprised the steps of: before the step B1
Move angle, wherein there are linear relationship, slopes for the backspin angle of the detected value d and the camera lens of the image mould group are as follows:Pass through formula θ=(d-D0) × k is able to calculate the angle that the camera lens for obtaining the image mould group needs movement.
As shown in figure 9, the step C further comprises step C1: by weighing direction modulation transfer function data processing skill
Art further executes the camera lens adjustment movement of the image mould group.
It is noted that the step C1 also obtains as following steps: being improved by orientation filtering technique to the shadow
The accuracy acted as the adjustment of the camera lens of mould group.
Preferably, the step C1 further comprises following steps:
C1.1: the adjustment data of the camera lens of the image mould group are collected；And
C1.2: the focusing parameter of the camera lens of the image mould group is corrected, wherein the focusing parameter includes for different batches
The focusing parameter of the secondary image mould group.
Preferably, if ideal of the Gao Yuqi when completing to focus position of currently determining of the camera lens of the image mould group determines high phase
Difference is larger, then the currently fixed high h that the camera lens for adjusting the image mould group is further comprised the steps of: before step A is fixed to the ideal
High average height H0, wherein the image mould group currently determines the acquisition of high pass laser ranging technique.
Preferably, as shown in fig. 7, the step B is also included the following steps:
B1: setting the first deviation DupperAnd the second deviation Dlower, the camera lens of the image mould group is complete
It is scale value D at the pixel distance between the ideally described mark point of focusing0, the first deviation DupperGreater than described
Scale value D0, the second deviation DlowerLess than the scale value D0；And
B2: judge the current detected value d in the evaluation and test region whether between the first deviation DupperWith institute
State the second deviation DlowerBetween, if it is not, the camera lens of the image mould group is then driven to make the detected value d towards scale value D0It leans on
Closely, the scale value D0For the image mould group camera lens complete focusing the ideally described mark point between pixel away from
From；And
B3: the evaluation and test region is had when the current center resolving power in the evaluation and test region is with ideal focus state
Center of maximum resolving power to adjust the step-length of the actuating motor for the camera lens for driving the image mould group, if the evaluation and test region
Current center resolving power is MTFstd1, the MTFstd1Lower than it is described assessment region center of maximum resolving power 1/3 when, it is described
Actuating motor is with the first step-length θstd1The camera lens of the image mould group is adjusted；If the current center solution in the evaluation and test region
Image force is MTFstd2The MTFstd2Higher than the MTFstd1And lower than it is described assessment region center of maximum resolving power 2/3 when,
The actuating motor is with the second step-length θstd2The camera lens of the image mould group is adjusted；If it is described evaluation and test region it is current in
Heart resolving power is greater than the MTFstd2But when being less than the center of maximum resolving power in the evaluation and test region, the actuating motor is with third
Step-length θfineThe camera lens of the image mould group is adjusted, wherein the first step-length θstd1, the second step-length θstd2With
And the third step-length θfineIt is sequentially increased.
Preferably, as shown in figure 8, the step B2 further includes following steps: calculating the shifting of the camera lens of the image mould group
Dynamic angle, wherein there are linear relationship, slopes for the backspin angle of the detected value d and the camera lens of the image mould group are as follows:Pass through formula θ=(d-D0) × k calculates the angle for obtaining the camera lens needs movement of the image mould group, so that the inspection
Measured value d is towards the scale value D0It is close.
Preferably, there is maximum focusing to the focusing movement of the camera lens of the image mould group in the image module focusing method
Number, it is affiliated when the camera lens of the image mould group reaches the maximum focusing number by the number that the actuating motor is adjusted
Image module focusing method be able to exit to described in current should mould group focusing movement, and then guarantee the image mould group
Production efficiency.
As shown in Figure 10, the step C1 also obtains as following steps: passing through orientation filtering technique and adjusts the image mould
The camera lens of group is to adjust the accuracy of movement.
Above content is enumerating for specific embodiments of the present invention, for the equipment and structure of wherein not detailed description, is answered
When being interpreted as that the existing common apparatus in this field and universal method is taken to be practiced.
The above embodiment of the present invention is only to illustrate that technical solution of the present invention is used simultaneously, only the column of technical solution of the present invention
It lifts, the technical solution and its protection scope being not intended to restrict the invention.Using equivalent technologies mean, equivalent apparatus etc. to this hair
The improvement of technical solution disclosed in bright claims and specification is considered to be without departing from claims of the present invention
And range disclosed in specification.
Claims (6)
1. a kind of image module focusing method, which is characterized in that described method includes following steps:
A: the image information of mark version is obtained by image mould group, wherein the mark version has an evaluation and test region, in the evaluation and test area
Multiple mark points are equipped in domain；
B: drive the camera lens of the image mould group mobile according to the image information, wherein the step B comprising steps of
B1: the first deviation D of settingupperAnd the second deviation Dlower, the camera lens of the image mould group is in the ideal for completing focusing
Pixel distance under state between the mark point is scale value D0, the first deviation DupperGreater than the scale value D0, described
Second deviation DlowerLess than the scale value D0；
B2: judge the current detected value d in the evaluation and test region whether between the first deviation DupperPartially with described second
Difference DlowerBetween, if it is not, the camera lens of the image mould group is then driven to make the detected value d towards scale value D0It is close, it is described
Scale value D0For the image mould group camera lens complete focusing the ideally described mark point between pixel distance,
In, by comparing the detected value d and scale value D0Size judge the image mould group camera lens moving direction, if the inspection
Measured value d is greater than the scale value D0, then the camera lens of image mould group described in backspin；If the detected value d is less than the scale value D0, then on
Revolve the camera lens of the image mould group；And
B3: the evaluation and test region has most when the current center resolving power and ideal focus state in the evaluation and test region
Big center resolving power is to adjust the step-length of the actuating motor for the camera lens for drive the image mould group, if described evaluate and test the current of region
Center resolving power is MTFstd1, the MTFstd1Lower than it is described evaluation and test region center of maximum resolving power 1/3 when, the movement
Motor is with the first step-length θstd1The camera lens of the image mould group is adjusted；If the current center resolving power in the evaluation and test region
For MTFstd2The MTFstd2Higher than the MTFstd1It is described and when being lower than the 2/3 of the center of maximum resolving power for evaluating and testing region
Actuating motor is with the second step-length θstd2The camera lens of the image mould group is adjusted；If the current center solution in the evaluation and test region
Image force is greater than the MTFstd2But when being less than the center of maximum resolving power in the evaluation and test region, the actuating motor is with third step-length
θfineThe camera lens of the image mould group is adjusted, wherein the first step-length θstd1, the second step-length θstd2And institute
State third step-length θfineIt is sequentially increased；And
C: the focussing process of the camera lens of image mould group described in intelligent decision, wherein the step C comprising steps of
Data obtained in deterministic process are collected for the retrospect of the production information of the image mould group and batch products focusing
Condition is included；
The camera lens adjusting parameter of the image mould group is automatically updated and corrected according to the batch of the image mould group and model；And
Modulation transfer function change curve by being superimposed the evaluation and test region of each mark version respectively determines each institute's commentary to analyze
Survey whether region completes to reach focusing standard；And
D: judging whether focusing is completed, no to then follow the steps A, is the focusing movement for exiting presently described image mould group, wherein
It is described mark version image information include it is described mark version evaluation and test region mark point pixel distance detected value d and the mark version
Evaluate and test the modulation delivery value in region.
2. the method as described in claim 1, the step B2 further includes following steps: calculating the camera lens of the image mould group
Move angle, wherein there are linear relationship, slopes for the backspin angle of the detected value d and the camera lens of the image mould group are as follows:Pass through formula θ=(d-D0) × k calculates the angle for obtaining the camera lens needs movement of the image mould group, so that the inspection
Measured value d is towards the scale value D0It is close.
3. the method as described in claim 1, the step C further comprises step C1: modulating transmitting data by omnidirection
Processing technique further executes the camera adjusting movement to the image mould group.
4. the method as described in claim 1, the step C further comprises step C1: adjusting institute by orientation filtering technique
The camera lens of image mould group is stated to adjust the accuracy of movement.
5. method as claimed in claim 3, the step C1 further comprises following steps:
C1.1: the adjusting data of the camera lens of the image mould group are collected；And
C1.2: the focusing parameter of the camera lens of the image mould group is corrected, wherein the focusing parameter includes for different batches
The focusing parameter of the image mould group.
6. method as claimed in claim 4, the step C1 further comprises following steps:
C1.1: the adjustment data of the camera lens of the image mould group are collected；And
C1.2: the focusing parameter of the camera lens of the image mould group is corrected, wherein the focusing parameter includes for different batches
The focusing parameter of the image mould group.
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| CN201410797009.XA CN105791657B (en) | 2014-12-19 | 2014-12-19 | A kind of image module focusing method |
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| CN108692921B (en) * | 2018-05-30 | 2020-10-02 | 信利光电股份有限公司 | Camera module analysis force and lens analysis force approval method |
| CN109257539B (en) * | 2018-10-15 | 2021-01-12 | 昆山丘钛微电子科技有限公司 | Focusing method and device, electronic equipment and computer readable storage medium |
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| JP4834592B2 (en) * | 2007-03-29 | 2011-12-14 | 株式会社東芝 | 3D image display device |
| JP5076240B2 (en) * | 2008-02-05 | 2012-11-21 | 富士フイルム株式会社 | Imaging apparatus, imaging method, and program |
| CN102929074A (en) * | 2011-08-12 | 2013-02-13 | 华晶科技股份有限公司 | Lens calibration system of employing imaging technology and calibration method thereof |
| CN103257510B (en) * | 2013-04-27 | 2016-01-06 | 宁波舜宇光电信息有限公司 | A kind of fast automatic focus adjustment method |
| CN103702035B (en) * | 2014-01-14 | 2017-01-04 | 昆山丘钛微电子科技有限公司 | Photographic head module quickly regulating method based on FOV |
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